US20050059998A1 - Ultra-high-frequency notch filter - Google Patents
Ultra-high-frequency notch filter Download PDFInfo
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- US20050059998A1 US20050059998A1 US10/661,137 US66113703A US2005059998A1 US 20050059998 A1 US20050059998 A1 US 20050059998A1 US 66113703 A US66113703 A US 66113703A US 2005059998 A1 US2005059998 A1 US 2005059998A1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
- H05K1/0233—Filters, inductors or a magnetic substance
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/1006—Non-printed filter
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10636—Leadless chip, e.g. chip capacitor or resistor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- This invention relates to suppression of electromagnetic interference (EMI).
- LANs local area networks
- An example thereof is the Gigabit Ethernet LAN.
- the high-frequency transmission affected by such transmission lines make suppression of their radiated emissions a significant challenge, on account of the fact that radiated emissions, and the crosstalk to other signal lines caused thereby, increase as transmission frequency increases.
- a notch filter is designed to reject a band of frequencies while passing through all other frequencies.
- notch filters to filter out EMI is known (see, e.g., U.S. Pat. No. 6,539,253)
- a technical challenge in developing a notch filter for EMI suppression is how to effectively deal with parasitic inductance and capacitance, which can deleteriously affect the intended performance of the filter.
- parasitic inductance and capacitance can deleteriously affect the intended performance of the filter.
- Even small parasitic effects can cause significant problems and therefore must be accounted for in the notch filter design.
- an apparatus comprises a capacitor having a body and a pair of terminals attached to the body, and a conductor defined on the body and connecting the terminals, the conductor having an inductance defining together with a capacitance of the capacitor a parallel LC circuit.
- the circuit is tuned by varying the width of the traces.
- the apparatus is illustratively suited for use as a notch filter.
- a notch filter having a notch center frequency comprises a capacitor that has a body and a pair of terminals attached to the body and that has a resonant frequency equal to or greater than the notch center frequency, and further comprises a conductive trace that has an inductance and that extends along the body and connects the terminals.
- PCB printed circuit board
- a PCB comprises a signal conductor comprising a pair of discrete conductor segments defined by the PCB, a ground plane defined by the PCB, a capacitor having a body and a pair of terminals on the body that connect the capacitor between the segments, and a conductor defined on the body and connecting the pair of terminals.
- the conductor has an inductance and forms with the capacitor a notch filter for the signal conductor such that the product of the inductance and the capacitance of a virtual conductive loop formed by the notch filter and the ground plane equals a center frequency of the notch of the notch filter.
- Advantages of the invention include a notch filter that is effective at ultra-high frequencies, that is easy to construct, that is tuneable, that minimizes the number of parts used in its construction, that is compact so that it takes up little real estate on a printed circuit board, and that is compatible with surface-mount circuit-assembly techniques.
- FIG. 1 is a perspective diagram of a printed-circuit-board-mounted notch filter that includes an illustrative embodiment of the invention
- FIG. 2 is a graph of load lines of capacitors illustratively used to implement a 1 GHz notch filter
- FIG. 3 is a graph of load lines of capacitors illustratively used to implement a 4.8 GHz notch filter
- FIG. 4 is a graph of load lines of capacitors illustratively used to implement a 6.25 GHz notch filter.
- FIG. 1 shows an illustrative embodiment of a notch filter 100 mounted on a printed-circuit board (PCB) 120 .
- Notch filter 100 spans two segments 124 a and 124 b of a printed-circuit conductor 124 carrying signals that are to be filtered for EMI.
- Each segment of conductor 124 terminates in a solder pad 126 to which notch filter 100 is electrically connected, e.g., by a component surface-mounting process.
- Notch filter 100 consists of a capacitor 102 , preferably a surface-mount capacitor, and a conductive trace 106 of width w and length l defined by (e.g., plated or printed on) and extending the length of body 103 of capacitor 102 .
- Capacitor 102 is electrically connected to solder pads 126 by conductive terminals 104 that extend from opposite ends of body 103 of capacitor 102 .
- Trace 106 is electrically connected to terminals 104 , and acts as an inductor there between.
- Capacitor 102 and trace 106 together form a parallel inductive-capacitive (LC) circuit between the segments of conductor 124 .
- LC inductive-capacitive
- PCB 120 has a ground plane 122 as one of its layers, which serves as a return path for signals conducted by conductor 124 .
- Ground plane 122 , capacitor 102 , and trace 106 together form a virtual conductive loop 130 at the resonant frequency of the structure that is formed by them.
- Loop 130 has a height h l which is the distance between trace 106 and ground plane 122 . In consists of the height h c of capacitor 102 and depth h g at which ground plane 122 is buried in PCB 120 .
- a standard thickness of PCB 120 is 62 mils; consequently, h g is normally anywhere between 1 mil and 61 mils.
- the product of the capacitance (C) and inductance (L) of loop 130 define the center frequency f n of the notch implemented by filter 100 that will be filtered out of the signals on conductor 124 .
- capacitors have an individual resonant frequency f c below which they behave capacitively and above which they behave inductively.
- f c of capacitor 102 equal or exceed f n .
- the thickness t of trace 106 is a standard and unvarying approximately 1 mil (. ⁇ 7 to ⁇ 1.4 mil) of copper, aluminum, or other conductor; i.e., the standard thickness of a printed circuit trace.
- values of L that are reasonably achievable by varying the width w of trace 106 are between about 0.2 nH and about 1.5 nH.
- an available suitable capacitor 102 is selected.
- an illustrative commercially-available capacitor is a surface-mountable 0603-type capacitor (length of 60 mils, width and height of 30 mils) of 27 pF.
- the selection of capacitor 102 determines height h l of loop 130 (h g being fixed by PCB 120 ) and length l of trace 106 .
- the inductance L of loop 130 therefore must be tuned to produce the desired value of f n by varying the width w of trace 106 .
- the proper width w of trace 106 is determined from the following formulas.
- L ⁇ ( h g , w , t , l ) 5.0 ⁇ ( 10 - 6 ) ⁇ l ⁇ ln ⁇ ⁇ 2 ⁇ ( h l + h g ) ⁇ ⁇ ( w + t ) ⁇ , where
- load line 204 is derived by superimposing two surface plots, with their intersection being the load line for a given notch filter center frequency fn.
- One of the surface plots is a plot of the achievable resonant frequencies as a function of the width w of trace 106 and the depth h g of the reference return path. This surface plot is for a given fixed capacitance of 27 pF in this example.
- h l (30+h g ) mils.
- a reference plane is superimposed onto the aforementioned first surface plot.
- This reference plane is the desired notch filter resonant frequency f n of 1 GHz in this example.
- the intersection of these two surfaces is line 204 that highlights the needed width of trace 106 as a function of the depth h g of ground plane 122 within printed circuit board 120 .
- the 27 pF 0603-type capacitor is currently believed to be the only capacitor that will provide a 1 GHz notch filter for any depth of ground plane 122 within a conventional 62 mil thick printed circuit board 120 .
- the depth h g of ground plane 122 must be greater than some minimal depth, or will only work within some subset of the entire 62 mil PCB thickenss.
- a plurality of capacitors can be connected in parallel to form capacitor 102 , and one or more of those capacitors can carry traces that together, in parallel, form trace 106 . If capacitors of slightly-different values are used in parallel, the result is a plurality of slightly-different notch filters—or, equivalently, a notch filter having a wider notch—resuting in improved EMI attenuation.
- One of the advantages of a notch filter 100 constructed in the illustrative manner is that it occupies a very small amount of PCB real estate.
- the capacitors may be vertically stacked, illustratively as described in U.S. patent aplication Ser. No. 10/292,670, filed on Nov. 12, 2002, and assigned to the same assignee as this application.
- a 23 pF 0603-type capacitor may be used in parallel with the 27 pF capacitor.
- the load line for the parallel combination of the 23 pF and 27 pF capacitors is shown as load line 202 in FIG. 2 .
- FIG. 3 shows a load line 304 for a surface-mountable 0402-type capacitor (length of 40 mils, width and height of 20 mils) of 1.7 pF used to implement a 4.8 GHz notch filter.
- the 1.7 pF capacitor may advantageously be used in parallel with a 0402-type capacitor of 1.508 pF to implement the 4.8 GHz notch filter.
- the load line for the parallel combination of the two capacitors is shown as load line 302 in FIG. 3 .
- FIG. 3 shows a load line for the parallel combination of the two capacitors.
- the load line for the parallel combination of the two capacitors is shown as load line 402 in FIG. 4 .
Abstract
Description
- This invention relates to suppression of electromagnetic interference (EMI).
- Use of high-bandwidth transmission lines to implement local area networks (LANs) is becoming increasingly common. An example thereof is the Gigabit Ethernet LAN. The high-frequency transmission affected by such transmission lines make suppression of their radiated emissions a significant challenge, on account of the fact that radiated emissions, and the crosstalk to other signal lines caused thereby, increase as transmission frequency increases.
- A notch filter is designed to reject a band of frequencies while passing through all other frequencies. Although the use of notch filters to filter out EMI is known (see, e.g., U.S. Pat. No. 6,539,253), a technical challenge in developing a notch filter for EMI suppression is how to effectively deal with parasitic inductance and capacitance, which can deleteriously affect the intended performance of the filter. At ultra-high transmission frequencies, even small parasitic effects can cause significant problems and therefore must be accounted for in the notch filter design.
- This invention is directed to solving these and other problems and disadvantages of the prior art. According to one aspect of the invention, an apparatus comprises a capacitor having a body and a pair of terminals attached to the body, and a conductor defined on the body and connecting the terminals, the conductor having an inductance defining together with a capacitance of the capacitor a parallel LC circuit. The circuit is tuned by varying the width of the traces. The apparatus is illustratively suited for use as a notch filter. According to another aspect of the invention, a notch filter having a notch center frequency comprises a capacitor that has a body and a pair of terminals attached to the body and that has a resonant frequency equal to or greater than the notch center frequency, and further comprises a conductive trace that has an inductance and that extends along the body and connects the terminals. Illustratively, when mounted on a printed circuit board (PCB) in a signal line proximate to a ground plane, the notch filter and the ground plane form a virtual conductive loop the product of whose inductance and capacitance is the notch center frequency. According to yet another aspect of the invention, a PCB comprises a signal conductor comprising a pair of discrete conductor segments defined by the PCB, a ground plane defined by the PCB, a capacitor having a body and a pair of terminals on the body that connect the capacitor between the segments, and a conductor defined on the body and connecting the pair of terminals. The conductor has an inductance and forms with the capacitor a notch filter for the signal conductor such that the product of the inductance and the capacitance of a virtual conductive loop formed by the notch filter and the ground plane equals a center frequency of the notch of the notch filter.
- Advantages of the invention include a notch filter that is effective at ultra-high frequencies, that is easy to construct, that is tuneable, that minimizes the number of parts used in its construction, that is compact so that it takes up little real estate on a printed circuit board, and that is compatible with surface-mount circuit-assembly techniques.
- These and other features and advantages of the invention will become more apparent from the following description of an illustrative embodiment of the invention considered together with the drawing in which:
-
FIG. 1 is a perspective diagram of a printed-circuit-board-mounted notch filter that includes an illustrative embodiment of the invention; -
FIG. 2 is a graph of load lines of capacitors illustratively used to implement a 1 GHz notch filter; -
FIG. 3 is a graph of load lines of capacitors illustratively used to implement a 4.8 GHz notch filter; and -
FIG. 4 is a graph of load lines of capacitors illustratively used to implement a 6.25 GHz notch filter. -
FIG. 1 shows an illustrative embodiment of anotch filter 100 mounted on a printed-circuit board (PCB) 120.Notch filter 100 spans two segments 124 a and 124 b of a printed-circuit conductor 124 carrying signals that are to be filtered for EMI. Each segment ofconductor 124 terminates in asolder pad 126 to whichnotch filter 100 is electrically connected, e.g., by a component surface-mounting process. -
Notch filter 100 consists of acapacitor 102, preferably a surface-mount capacitor, and aconductive trace 106 of width w and length l defined by (e.g., plated or printed on) and extending the length ofbody 103 ofcapacitor 102. Capacitor 102 is electrically connected tosolder pads 126 byconductive terminals 104 that extend from opposite ends ofbody 103 ofcapacitor 102. Trace 106 is electrically connected toterminals 104, and acts as an inductor there between.Capacitor 102 andtrace 106 together form a parallel inductive-capacitive (LC) circuit between the segments ofconductor 124. PCB 120 has aground plane 122 as one of its layers, which serves as a return path for signals conducted byconductor 124.Ground plane 122,capacitor 102, andtrace 106 together form a virtualconductive loop 130 at the resonant frequency of the structure that is formed by them.Loop 130 has a height hl which is the distance betweentrace 106 andground plane 122. In consists of the height hc ofcapacitor 102 and depth hg at whichground plane 122 is buried in PCB 120. A standard thickness ofPCB 120 is 62 mils; consequently, hg is normally anywhere between 1 mil and 61 mils. The product of the capacitance (C) and inductance (L) ofloop 130 define the center frequency fn of the notch implemented byfilter 100 that will be filtered out of the signals onconductor 124. - As is known, capacitors have an individual resonant frequency fc below which they behave capacitively and above which they behave inductively. Typically, the smaller is the capacitance of a capacitor, the smaller is its physical package, and the higher is its resonant frequency fc. For ease of design, it is desirable that fc of
capacitor 102 equal or exceed fn. At this fc, the capacitance C ofloop 130 is effectively the capacitance ofcapacitor 102. Consequently, the required inductance L ofloop 130 is L=1/(4π2fn 2 C). Inductance L is provided byloop 130. Inductance L is related to loop height hl as follows: L=5(10−3)ln
where L is measured in pH, hl is measured in mils, l is the length oftrace 106 in inches, and d is the diameter in mils of an equivalent circular cross-section having a circumference πd equal to twice the sum of the width w and thickness t oftrace 106. L is tuned by varying the width w oftrace 106. It is assumed that the thickness t oftrace 106 is a standard and unvarying approximately 1 mil (.˜7 to ˜1.4 mil) of copper, aluminum, or other conductor; i.e., the standard thickness of a printed circuit trace. Given the dimensions of conventional surface-mountable capacitors, values of L that are reasonably achievable by varying the width w oftrace 106 are between about 0.2 nH and about 1.5 nH. - In this illustrative example, it is assumed that
conductor 124 suffers from EMI or crosstalk from a Gigabit Ethernet, i.e., fn=1 GHz. Given fn and the reasonably-achievable values of L, an availablesuitable capacitor 102 is selected. In this example, an illustrative commercially-available capacitor is a surface-mountable 0603-type capacitor (length of 60 mils, width and height of 30 mils) of 27 pF. The selection ofcapacitor 102 determines height hl of loop 130 (hg being fixed by PCB 120) and length l oftrace 106. The inductance L ofloop 130 therefore must be tuned to produce the desired value of fn by varying the width w oftrace 106. - The proper width w of
trace 106 is determined from the following formulas.
where -
- L=inductance (in μH) of
loop 130 - hg=vertical distance from bottom surface of
capacitor 102 to the return reference plane 122 (in mils) - hl=height of capacitor 102 (in mils)
- w=width of trace 106 (in mils)
- t=thickness (height) of trace 106 (in mils)
- l=length of trace 106 (in mils)
where - fn=center frequency of the notch filter, and
- C=capacitance (in farads) of
loop 130
The procedure for determining w, and hg for fixed t, l, and C values is as follows:
- L=inductance (in μH) of
- (1) Plot fn(hg,w,t,l,C) for 1≦hg≦hpcb (total thickness of
PCB 120 in mils) and - in mils as a surface plot, with hg as the x-axis and w as the y-axis. The vertical z-axis is then the resonant frequency for a given (hg, w) pair.
- (2) Superimpose a “reference” surface plot on top of the surface plot generated from step (1) that represents the desired resonant frequency fn. This surface plot will necessarily be a planar surface and should cover the entire (hg, w) range of values as stated in step (1).
- (3) The intersection of the surface plot from (1) and the planar surface plot from (2) represents the full range of (hg, w) pairs that will produce the desired resonant frequency. This intersecting contour will be a line, referred to as a load line. Implement the solution by fabricating an electroplated
copper trace 106 of length l (mils), and width w (mils). - (4) If no intersection results from step (3), alter the value of the capacitance C until an intersecting contour is generated from the two surface plots. Make sure to select C such that this capacitor behaves capacitively slightly beyond the desired resonant frequency. In other words, the selected capacitor must have a resonant frequency fc that exceeds the desired resonant frequency fn of the notch filter.
- (5) If the variable hg is known a-priori, then select the (hg, w) pair that lies on the load line determined from step (3). Implement the solution by fabricating
trace 106 of length l, and width w. Usually hg is known a-priori, since the layer stackup of printedcircuit board 120 is known before designing the notch filter. -
FIG. 2 shows aload line 204 that defines the value of w as a function of hg at fn=1 GHz for a 27 pF 0603-type capacitor. As described aboveload line 204 is derived by superimposing two surface plots, with their intersection being the load line for a given notch filter center frequency fn. One of the surface plots is a plot of the achievable resonant frequencies as a function of the width w oftrace 106 and the depth hg of the reference return path. This surface plot is for a given fixed capacitance of 27 pF in this example. Also, in this example, hl=(30+hg) mils. Next, a reference plane is superimposed onto the aforementioned first surface plot. This reference plane is the desired notch filter resonant frequency fn of 1 GHz in this example. The intersection of these two surfaces isline 204 that highlights the needed width oftrace 106 as a function of the depth hg ofground plane 122 within printedcircuit board 120. The 27 pF 0603-type capacitor is currently believed to be the only capacitor that will provide a 1 GHz notch filter for any depth ofground plane 122 within a conventional 62 mil thick printedcircuit board 120. There are other capacitor values that can provide a 1 GHz notch filter; however, these other values will prevent the depth hg ofground plane 122 from covering the entire 62 mil thickness ofPCB 120. In these cases, the depth hg ofground plane 122 must be greater than some minimal depth, or will only work within some subset of the entire 62 mil PCB thickenss. These constraints are restrictive and limit the practicality of using anything but an 0603-type 27 pF capacitor. - Computer simulations indicate that
notch filter 100 constructed as described above produces an attenuation better than 7 dB of the 1 GHz EMI. - Instead of using one
capacitor 102 and trace 106 to implementnotch filter 100, a plurality of capacitors can be connected in parallel to formcapacitor 102, and one or more of those capacitors can carry traces that together, in parallel,form trace 106. If capacitors of slightly-different values are used in parallel, the result is a plurality of slightly-different notch filters—or, equivalently, a notch filter having a wider notch—resuting in improved EMI attenuation. One of the advantages of anotch filter 100 constructed in the illustrative manner is that it occupies a very small amount of PCB real estate. To preserve this advantage in the case of a notch filter costructed from a plurality of capacitors, the capacitors may be vertically stacked, illustratively as described in U.S. patent aplication Ser. No. 10/292,670, filed on Nov. 12, 2002, and assigned to the same assignee as this application. In this illustrative example of a 1 GHz notch filter, a 23 pF 0603-type capacitor may be used in parallel with the 27 pF capacitor. The load line for the parallel combination of the 23 pF and 27 pF capacitors is shown asload line 202 inFIG. 2 . - Of course, the invention may be used to implement notch filters at frequencies other than 1 GHz. Illustatively,
FIG. 3 shows aload line 304 for a surface-mountable 0402-type capacitor (length of 40 mils, width and height of 20 mils) of 1.7 pF used to implement a 4.8 GHz notch filter. Correspondingly to the exampleFIG. 2 , the 1.7 pF capacitor may advantageously be used in parallel with a 0402-type capacitor of 1.508 pF to implement the 4.8 GHz notch filter. The load line for the parallel combination of the two capacitors is shown asload line 302 inFIG. 3 . Also illustratively,FIG. 4 showsload line 404 for a surface-mountable 0402-type capacitor of 1.023 pF used to implement a 6.1 GHz notch filter. Again, this capacitor may advantageously be used in parallel with an 0402-type capacitor of 0.9 pF to implement the 6.1 GHz notch filter. The load line for the parallel combination of the two capacitors is shown asload line 402 inFIG. 4 . - Of course, various changes and modifications to the illustrative embodiment described above will be apparent to those skilled in the art. These changes and modifications can be made without departing from the spirit and the scope of the invention and without diminishing its attendant advantages. It is therefore intended that such changes and modifications be covered by the following claims except insofar as limited by the prior art.
Claims (18)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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US10/661,137 US7427904B2 (en) | 2003-09-12 | 2003-09-12 | Ultra-high-frequency notch filter having an inductance set by selecting a conductor width |
EP04250563A EP1517441A2 (en) | 2003-09-12 | 2004-02-03 | Ultra-high-frequency notch filter |
CA002457252A CA2457252A1 (en) | 2003-09-12 | 2004-02-09 | Ultra-high-frequency notch filter |
JP2004066514A JP2005094730A (en) | 2003-09-12 | 2004-03-10 | Ultra-high-frequency notch filter |
MXPA04008642A MXPA04008642A (en) | 2003-09-12 | 2004-09-06 | Ultra-high-frequency notch filter. |
CNA2004100768192A CN1595797A (en) | 2003-09-12 | 2004-09-07 | Ultra-high-frequency notch filter |
KR1020040072390A KR100702751B1 (en) | 2003-09-12 | 2004-09-10 | Ultra-high-frequency notch filter |
Applications Claiming Priority (1)
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US10/661,137 US7427904B2 (en) | 2003-09-12 | 2003-09-12 | Ultra-high-frequency notch filter having an inductance set by selecting a conductor width |
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US20050059998A1 true US20050059998A1 (en) | 2005-03-17 |
US7427904B2 US7427904B2 (en) | 2008-09-23 |
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US10/661,137 Expired - Fee Related US7427904B2 (en) | 2003-09-12 | 2003-09-12 | Ultra-high-frequency notch filter having an inductance set by selecting a conductor width |
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US (1) | US7427904B2 (en) |
EP (1) | EP1517441A2 (en) |
JP (1) | JP2005094730A (en) |
KR (1) | KR100702751B1 (en) |
CN (1) | CN1595797A (en) |
CA (1) | CA2457252A1 (en) |
MX (1) | MXPA04008642A (en) |
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- 2004-02-09 CA CA002457252A patent/CA2457252A1/en not_active Abandoned
- 2004-03-10 JP JP2004066514A patent/JP2005094730A/en not_active Abandoned
- 2004-09-06 MX MXPA04008642A patent/MXPA04008642A/en active IP Right Grant
- 2004-09-07 CN CNA2004100768192A patent/CN1595797A/en active Pending
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Also Published As
Publication number | Publication date |
---|---|
KR20050027049A (en) | 2005-03-17 |
MXPA04008642A (en) | 2004-12-09 |
KR100702751B1 (en) | 2007-04-03 |
US7427904B2 (en) | 2008-09-23 |
CA2457252A1 (en) | 2005-03-12 |
JP2005094730A (en) | 2005-04-07 |
CN1595797A (en) | 2005-03-16 |
EP1517441A2 (en) | 2005-03-23 |
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